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Q.5. A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
Answers (1)
For the distant vision:
The power of the lens, given
Hence the focal length will be:
Therefore, the focal length of the lens required for correcting distant vision will be: (Here, the negative sign of focal length tells us that it is a concave lens).
For near vision:
The power of the lens, given
Hence the focal length will be:
Therefore, the focal length of the lens required for correcting near vision will be: (Here, the positive sign of focal length tells us that it is a convex lens).
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